184 JITfRITLE. HYDROMYS 



d. Skeleton 



r Chili. Purchased of Mr. Bridges. 



e. Skull. I 



f, g. Skulls. From Mr. Yam-ell's Collection. 



h. Skull. From the Zoological Society's Collection. 



CERCOMYS. 



The Cercomys. Cercomys cunicularius. 



F.Cuv., Mamm. iii. pi. 60; Nouv. Ann. du Mus. i. p. 449. pi. 18. fig. 1 

 (molar teeth of upper jaw), pi. 19. figs. 1, 2 (skull). — Waterhouse, 

 Nat, Hist. Mamm. ii. p. 305. pi. 16. figs. 2, 2 a (skull), copied from 

 F. Cuvier'a figure. 



FIBER. 



Teeth :— Incisors £j ; Molars jj=f; = 16. 



The Ondatra. Fiber zibethicus. 



Pander und B 1 Alton, Vergl. Osteol. no. 6. pi. 8a, b (skull). — Baud. 



Mamm. N. America, pi. 54. fig. 6266 (teeth), 1859. 

 Mus zibeticus, F. Car., Dents des Mamm. p. 157. no. 53 (dentition), 



1825. 

 Ondatra zibethica, Waterhouse, Mag. Nat. Hist. 1839, p. 594. fig. 70, 



—Brandt, Mem. Acad. St. P^tersb. vii. figs. 9-14 (skull). 



Cervical vertebra? 7 



Dorsal 13 



Lumbar 3 



Sacral 27 



Caudal 6 



*a. Skull (imperfect). North America. 



b, c. Skulls. From the Zoological Society's Collection. 



d. Skeleton. Purchased of Mr. Brandt. 



HYDROMYS. 



Teeth : — Incisors jfj ; Molars ^? ; =12. 



The Hydromys. Hydromys chrysogaster. 



Sehreb., Saugth. pi. 239 e. fig. (dentition).— Brandt, Mem. Acad. St. 



Pe"tersb. vii. tab. 11. figs. 1-6 (skull). 

 Hydromys flaviventer, Owen, Odont. pi. 105. fig. 18 (right ramus of 



lower jaw). 

 Hydromys leucogaster, F. Car., Dents des Mamm. p. 172. no. 63 (den 



tition). 



«. Skull. Australia. 



